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Ed Stover, Robert Pelosi, Michael Burton, Scott Ciliento, and Mark Ritenour

Adjacent but separate trials of `Oroblanco' and `Melogold', both triploid pummelo [Citrus grandis (L.) Osbeck] × grapefruit (Citrus paradisi Macf.) hybrids, were established on nine rootstocks in the Indian River citrus region of Florida in 1993. The trees on the citrandarin rootstock ×639 [Cleopatra mandarin (C. reticulata Blanco) × trifoliate orange (Poncirus trifoliata L.)] were significantly more productive than trees on any other rootstock tested for `Oroblanco' and all rootstocks except Swingle citrumelo (C. paradisi × P. trifoliata) and Cleopatra mandarin for `Melogold'. Cumulative production of `Oroblanco' on ×639, through year 9, was 50% higher than for Swingle or Volkamer lemon [C. limon (L.)], which were the next highest in yield. `Melogold' displayed extremely low yield, with 45% of trees producing fewer than 50 fruit total in the 9 years of this study. Carrizo citrange (C. sinensis Osbeck × P. trifoliata) produced the smallest trees with both scion varieties, reflecting poor adaptation of this rootstock to the calcareous soil at the trial site. As expected, acidity of `Oroblanco' and `Melogold' was much lower than would be observed for grapefruit when fall harvested, with similar total soluble solids (TSS), and much higher TSS: titratable acidity ratio. Some rootstock effects on internal quality were observed.

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Jude W. Grosser, Victor Medina-Urrutia, Govindarajulu Ananthakrishnan, and Patricia Serrano

Citrus, and the USDA/CSREES (USA) for grants that supported this research. The authors also thank Jim Graham for assistance with prescreening the pummelo seedlings.

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Masaki Yahata, Seiichi Harusaki, Haruki Komatsu, Kayo Takami, Hisato Kunitake, Tsutomu Yabuya, Kensuke Yamashita, and Pichit Toolapong

Research Center, for kindly providing `Banpeiyu' pummelo and `Ruby Red' grapefruit. This research was supported by Diet and Cancer Prevention: Exploring Research Technology, Miyazaki Prefecture Collaboration of Regional Entities for the Advancement of

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Jude W. Grosser, Divya Kainth, and Manjul Dutt

cross between a pummelo ( C. grandis Osbeck) and a sweet orange [ Citrus sinensis (L.) Osbeck] ( Barrett and Rhodes, 1976 ; Gmitter, 1995 ; Scora, 1975 ; Scora et al., 1982 ). The increasing competition and popularity of grapefruit in international

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Chunxian Chen, Jude W. Grosser, Milica Ćalović, Patricia Serrano, Gemma Pasquali, Julie Gmitter, and Fred G. Gmitter Jr

as replacements for sour orange. For the past several years, we have been working to develop superior sour orange-like rootstock somatic hybrids by combining mandarin and pummelo parents selected for good rootstock attributes ( Ananthakrishnan et al

Open access

Paemika Promkaew, Varit Srilaong, Chalermchai Wongs-Aree, Nutthachai Pongprasert, Samak Kaewsuksaeng, and Satoru Kondo

‘Tubtim Siam’ pummelo ( Citrus maxima ) is a geographical indication (GI) product with a ruby red pulp and a sweet aroma ( Kaewtubtim and Issarakraisila, 2016 ). ‘Tubtim Siam’ pummelo with redder pulp has a high added value. However, the degree of

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Yuan Yu, Chunxian Chen, Ming Huang, Qibin Yu, Dongliang Du, Matthew R. Mattia, and Frederick G. Gmitter Jr.

pummelo, and that hybridization between them has generated other genotypes ( Barrett and Rhodes, 1976 ; Scora, 1975 , 1988 ). Molecular analyses have been widely used in Citrus taxonomy studies. The three cultivated Citrus species concept was

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Atsu Yamasaki, Akira Kitajima, Norihiro Ohara, Mitsutoshi Tanaka, and Kojiro Hasegawa

pummelo and ‘Mukaku Kishu’, has been released ( Kobayashi, 1995 ; Yoshida et al., 2005a , 2005b ). Earlier studies of seedlessness in ‘Mukaku Kishu’ reported that pollen tube growth was inhibited after pollination, and seedless fruit was produced by

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Akira Kitajima, Atsu Yamasaki, Tsuyoshi Habu, Bannarat Preedasuttijit, and Kojiro Hasegawa

’ ponkan ( C. reticulata ) and ‘Banpeiyu’ pummelo ( C. maxima ) were extracted from immature leaves by a CTAB method, and the DNA concentration was adjusted to 100 ng·μL −1 . The total genomic DNA of the ponkan was labeled with digoxigenin-11-dUTP (Dig) and

Open access

Tengfei Pan, Peibin Huang, Jianwen Ye, Dongming Pan, Zhijun Fu, Heli Pan, Zhixiong Guo, Wenqin She, and Yuan Yu

‘Liuyuezao’ pummelo is a new very early-season cultivar developed from a spontaneous bud sport on a ‘Guanxi’ pummelo tree. Trees of ‘Liuyuezao’ are moderately large and vigorous in their growth habit. The fruit mature from late July to early